Where can I resell supplements or trade them?

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Does anyone know a good way to trade or sell them? There was one I tried to sell on eBay and the manufacturer said I was violating their trademark... what a pain. I have unopened bottles, but some are expired, and I have opened bottles too. Are there rules against selling opened bottles or expired? I know for a store they can't sell expired ones, but if I can't either, maybe Goodwill will take them? I have seen them selling OTC meds before but they may not take opened ones. I would rather not see them go to waste.